Intent 1:
To limit the probability that the performance of
mechanical ventilation systems will fall significantly below expectations
or that they will fail prematurely.
This is to
limit the probability of:
- the inadequate control of airborne pollutants, or oxygen
and other components necessary for breathable air,
- the inadequate control of relative humidity, which could
lead to condensation on interior surfaces,
- excessive negative pressure, which could lead to:
- the ingress of soil gases (such as methane and radon),
- the spillage of combustion products from fuel-burning
appliances that are susceptible to spillage, or
- moisture ingress from the ground, or
- excessive positive pressure, which could lead to condensation
within assemblies.
This is to limit the probability of negative effects on
the air quality of indoor spaces, which could lead to harm to persons.